function [ status ] = mx_eyelink_poll_trackers( )
%MX_eyelink_poll_trackers Asks all non-tracker computers (with EyeLink 
% software running) on the network to send their names and node address.
%
% Returns:
% 0 if successful, otherwise link error.
%
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% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com